What a photo visualisation gives you
Preevu starts with an existing photograph and asks an image model to show a selected change. The aim is to make an appearance easier to discuss: a new floor in this room, a new roof covering on this house, or a different surface on this driveway.
The result is an image. It does not contain verified measurements, material quantities or construction details.
What a measured drawing is for
A technical drawing or model can describe dimensions, levels, components and their relationships when prepared correctly. It gives the people involved a way to agree and work from specific information.
A photograph alone does not provide all that information. Even a very realistic generated roof or patio should not be treated as evidence that the design is feasible.
Why keeping the scene still needs checking
Preevu’s instructions ask the AI to retain the viewpoint, surrounding features and unrelated geometry. That is useful direction, but it is not a geometric lock. Small objects, edges and proportions can still change.
Use the before-and-after slider to spot those changes. If an alteration could affect the customer’s understanding of the proposal, correct the concept or explain the limitation before using it.
Use each at the right stage
A preview can help narrow the visual direction early in a conversation. Physical samples help confirm the actual material. Measurements and technical drawings establish the design and installation detail where needed.
The sensible sequence is to use the image for discussion, then agree the real product and work through the appropriate professional process.